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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c954bbb6934354ba0df1fb7142085f2d0263bc65e419ee161348127a832c2eb1' 
  AND token = 'wekQ2klEV4sHZZ1l3+CWykTVVlM+9PCa8fYiQYqDiow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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