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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '906362d99baa0a4353efd6ab153b8a77e64c9efb7286a49f62ac5a5a9e19f5b2' 
  AND token = '94F1kVF6aZ4lDcVE3WoxU2qZjO6U+hEiN3fcGuamGpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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