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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '437bfd905394ff70a21f859b33be11434d3ec95d99440c84a11310273555b3ff' 
  AND token = 'SaE2G2IUIgUq+RRb6kexZcXwr5mz21lPyIl1yRXtG1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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