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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb93332de437048d30e863e8a9a0e37ab72e50817a40c71addf6a027bc2f4115' 
  AND token = 'VkR5z032y9THRsnqhB+Gqspn75P4fGVKw8Ta4SDiY+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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