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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79dc1345a7f01d3ae6150e384c775293c1b2d43e9a9b01aaea340a840cd67e0' 
  AND token = 'rkyMuoavTZ2de3TUQFlhN619vh/uPtvTVmKPQrsa+z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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