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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a281b5db086f8b64e63e97e55b4fea2b1b26e78dda239623a6d9d635cdf4a7f7' 
  AND token = 'qsC1s508Av+y+SV2X4yTdFHGgQH0I5SMziujuGB0zbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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