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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f18a4c9fa5037fad483353c9c7402f19216f0ece20f62aa05530e6b0e51aa5' 
  AND token = '1PDI6ka/wiJooejg8rieNVXkK5FiZ1Z/S4e2UfN5fbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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