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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe0abfdbacae6aa81114243efa6cb0c75ee164c4ced71b7ef6c667a63a23ebe4' 
  AND token = 'MpN+x5ndbs/XOD+zSWMBt/s50U2xUYE3eSq2n+Gj3oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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