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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f2f5a79c352908a6d607bd226cb9e0b790bdf4db2dcd9d47c637c4e0d01762e' 
  AND token = '6UcGp92JijZzSoyyG+zS8duEvBbl5vPk0bJf4W9gGRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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