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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c565f2aacd790b6bc7a9690c302b054bda05e955dcc2a97366c2515fe8d94bc0' 
  AND token = 'jNm0T6jbG3N9KYkxjrzjRLq/nK2Vye03r9jxmg5NvjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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