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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e2c018cf78474c77fe5cc3bef015d25152ce5bcade89a6da2aa2dd287b3f58' 
  AND token = '9+IQ9or2Wl+EiuAl/RdBPA0ADhQl5lGVzWJ9zRL35zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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