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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8e25157285bc1afc5cd6254956f46a27b52246d0c13119512e43fd5af56e16a' 
  AND token = 'SWUgttyfT4fo8/J5PMBQSowZv2Op3yICkur7dEJp3MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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