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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a38c5e8211bb3ea90488e8e6d76e76936ba011ace1f4b32adaf07274e60bed98' 
  AND token = 'iigPTGXugFdOfBOaDg9vfyWdY0HG9g5KBrVuYtBRopI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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