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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cb79154f185eb8eb5fb29d25c4b96a10f6992de8d042db46fde9b47e71e21dc' 
  AND token = 'xV1hdFT4+XYTLM10XKFtS9lE4CK6QX6rubM7SEz064A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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