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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7344b8fbac279068a3672b55c4e0886a775201d0ab4d841ed91a867f3df4d9e' 
  AND token = 'b2knkf5ev0uKfw6aNeCNfvSj1/1cCbgCwPgocKm4ovk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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