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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5ce3779f9f99ab7a27da56293eeb4ce2ce58d300c0f882a4dff76b654f61c23' 
  AND token = 'ZXx6N4SOryAowik+GrQqnF0gLquW9pjSjWrWS7wQw6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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