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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c1c36f87d8ba19aee363bd1ee599cc18eadf32dbc683091789cad8295a11691' 
  AND token = 'g47sYRKsBhOrvhcKBA2iAnnXMrEmOa7/b/9vqGoa6DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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