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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95de60f3e3833973c48d2e888ab40da9af93d38648ec3a0da3009194e45700b6' 
  AND token = 'P+TnSEbvjZApzukwfyg4X00V2QTS7LjZH4+ZuRbL6oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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