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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34be4f273930dce63ee63841287a41c8998b19f23d8da7b96e4538aae69db361' 
  AND token = 'sM8Ap40qDZp8CwcAj/m+uWsbqtmYeMp7H0couYJvmaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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