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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e55e25d8374702c1bdcb5dba1c20627c6f3741256dc2d24ada3a294142576e' 
  AND token = 'lztr4tJ0Po0ydOQ93WUEcMoD945DzAatc/tjnFwCiXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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