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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c432c2fd27ea636dc8ef417f3aacdb9825a9b26d8a519b6bbf414d8d0608818e' 
  AND token = '046Gt2PtE2bzE+kluR45F8yJtIZCuiTRE99FKewCggA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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