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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a277bffef080fe9fbd24679086ad2e363d0eb78073792714084f44d16bb4f1c6' 
  AND token = '9KV6ecx2TtmrQ35YykjG5La0CnfobEeTAMdTi02MKh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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