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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33b52242e5fcc7a329c6a311ddc6b4e9141885a94fcca0deed1fc37a000655c3' 
  AND token = 'H/d26p8oCBOP5T7bfB0AWSIZoqUI42SEzxqX+M5Am6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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