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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61263dd3a565e73e4e27974cfc8f437d71cc388953bffcf3df099adeb6e1281d' 
  AND token = 'Gr6KiTftdDA7w/K1T/JweuL4b7Jrek3fizi4+TtP7DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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