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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14695eabb31819997a664e0e848d699b6547bce6d1348ecbccfae8decd9ab924' 
  AND token = '35zgAfBG7sxjk7XM6pyYyMWYBQgbqt2ymAQWDNX3thE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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