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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '752ae52664edffdd85244411f777670c1490883bad061c1249597fa7e4a86941' 
  AND token = 'LKVQ4Zm8CGaHBbXN8UWkxbwqKNdhkNIeHi2Mjb316A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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