SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05fbd27646773264844ff4999075138abd3bb91abbe93395fb5802523abbe0c9' 
  AND token = 'DPgswG1LYwwQE5qkTmLMBxQ7LdZ5uOVM0yIL/5p1VjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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