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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05a1e2e202686be02a1207ae8ca7012bfa504c9eefbf24893936d1723422194b' 
  AND token = 'SHLp/cn0A6TUX0m7DlKdSYCkIIgbKReyAWo/u28ZEqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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