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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee2618f988a44ced58a998ba5604cbb71728d6161a126ddb0e9aeeb90da48393' 
  AND token = '3Bji/jdMBSM3Oaa3BMK4ltpfb/b8Wij6qZp+o5ncNh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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