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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c4d40453fad880ef047de962f0c65aae40047b124f82f2056df73eb4cf2db5e' 
  AND token = '0ziORI0ZIucuVdG0GK20q+90YJ2831iVHkFUra4Xv50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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