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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c5608532ec4af51687e3ca250eee48fbe32e0541d7adccce4209341bef4f8ae' 
  AND token = 'fl8V/PUOsG5eaj86pbP94utPKDO5uVFDT7Uujg+MDLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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