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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ed3fd534ad7ca0addf07c897283b38d287b448ed4647530137330f047718c4d' 
  AND token = 'BH4a2Lqtn5EIcOIbBlGBDXJ1cNYqCCrO+gQBkhjAKAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}