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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5debfe722204698a355d195a352a7ab304d4b0cd05500e3054dc8e794b7a4c62' 
  AND token = 'aFsbe6lW6rmIe4szfNq5YPS7nAiBYzTNQV8YHk5GrAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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