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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ea8f98f22c19150725a8524c8ea3c37c06a65849f8a47e5e5780f1a3a1f302e' 
  AND token = '19Hsl4H/zNFUiatAFfWiz85mlE8wLH7y7TS6hsWHPUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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