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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71dbca8bafef72e2dc0ffb7a634859d844605320c09f47931527884fd59c9296' 
  AND token = 'zABMSk45955xBAI+iga3w4l9j9Ru0lkyfIg/C9IqIj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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