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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ef208848681e22b35b9b18b3c715033904cf69ecdc6bdb45e9cd68e2dafa8da' 
  AND token = 'G+7yDyzvEljmG2JJEJu2N4QNFC2YJGOSAuuo2/0S0BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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