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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01f54706647520f7b610b326b09f1e94c86aa0a342b8c22cbb3608c7eee89bdc' 
  AND token = 'rJBqJZ839Ge5QkBAe4jHUQc/M7YxX1aWf+8R55YAewA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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