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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75dc284a4bf651348cf60a3de0ddc106a508530628d2c3f6c6a11964ab32c7de' 
  AND token = 'w8+VwNtitY1s3dVSSblNBnWep+yj0UKpyIGU2G9IOL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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