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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a7137b3e19e584703b6f78c4b9911a868cb24dff12777c9368f67f74bcb9a59' 
  AND token = '9bp4fCDyzeY1RFNRQaEmBaTToNJNx10XVcY6xeDccco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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