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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64385c95cad4b2ad520fd84ec23d14c00a68adc47442854bff7f34a4c14eb0bd' 
  AND token = 'cPaW5Jbl+FQ2wBJLruFolHXwXB5HlBZ5u/li505sI6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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