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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc216e2557f85cadc4c3f4a0e7e6d89d2022b90f82ca56c70bb7ff243ddadb3c' 
  AND token = '/6bSiHNy5Iuvrm7SNwbtB5evt4BEtFrs3iTMJTygQMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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