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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3df0edeb0844c81bd726d28cbac84d5b72575e1591c355dcc7d11e20b5b33a7' 
  AND token = 'qVBHHsrBHmJLXxGzC2htSmEJOicqBRymfM8mwg+x2ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00119

JSON explain

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