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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42db93218e6df2b067c3a3cf3cb040af31d2244b6c313c1e2c13bcb22d1a4d9c' 
  AND token = 'rzXQX29k6A9cZhukW52jkAnGeDqcyJTAfe4THVTrU+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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