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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aafe64292ffd4aafb0012bc1162a6d4e1fa3ee32b5d60bdb209c0700ddc3a3a7' 
  AND token = 'kLJOsVMa9f689BJ7T98AZG0/Z5BlZ15u1YnMIwDOlH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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