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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88d1cbc1712799e7be45d6571aae6ac899328b5f5250e2856a44dca65124fe5b' 
  AND token = 'ey9gblb6Oauwp+RJ5t1i5OvHXKJuuXvijB5h0oEqeD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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