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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c01f347d7ea6e79ee63180d2b99af82cbef45908f041e19917ec4011801f3d' 
  AND token = '7xeAvNI84j9AkFlnNWnt7qp/zSWgllGModW/1Hskb/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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