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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b845db31bdd8eed80f8de5da447a384b5f89e5c030831ddc8d3b89d7ad8146' 
  AND token = 'uDKrh197TyJ2CFZYd5751+0tgEiGoNo1gimsMGS3xzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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