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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '975a8e1f84d2ceb55268856f868f0d3863da99206131b9a11247fb983382ccd0' 
  AND token = 'c+eBVKz9cTtHJmKDsZegTkLHk2hWxmNwz+ny070bJJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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