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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b47d9dfad9b011230fc8a91bdbe5ee22c50883a1f03c899685c3fefb6f01085a' 
  AND token = 'v9Ar1658Ev2FRQndpQD45oHVtmIdvAbwi5ZSkQAxuHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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