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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be5c1e4cc6957b2b8d7b17386d0f9d5936226de55d2edf0ed682f270e9be6956' 
  AND token = 'rlnuJtjo7r3U9rV9Zdi0AxJKXRU/rNHgJhpMwuebHDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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