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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1ceebb553f1f82df8bb66c36b8e31296a5dc1e49430e61915423b148730119' 
  AND token = '8s+GB/Aj9i/NWrIheX63xuXv+Rpo1L/7/9uLElffxVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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