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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd960749749046edabc486a9ccfa977565ffa9c7c0f24e0f91f8f4bca52499b' 
  AND token = 's3d+YLH/6AI99xCcJSefUhT3Vjct+fV6OZtkgyU3EgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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