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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20572dda2ec2a63303ca4b87b4463cf9df6069031721e9d6899b12dd62cc8880' 
  AND token = '7C+C2jOiZdl+Soap70xMq/YwO5UkEZt6RN2l6YE+uhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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