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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bace2b1159f5f57980fd9007d5f550e4eaabe407a6b3c8b4add386d5765c9869' 
  AND token = 'lh789EcxRsjXRycB/JANdEH139kjvwqDUsFVb45Egt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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