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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6600fe9639162fb4787f46fe21a027d9a4e62a8374c7b5e74cacb9d8ccf8c85e' 
  AND token = 'ilmCgRZ6RqqHyCKbbqyL7huig5GpkrMqvTQIxa030so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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