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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90f935533464d25e52de3c136a2f8b3f44b7ad190269ed58ac6cff7219f8c2f2' 
  AND token = 'Uq68cx/dZRYzXZT9l4mf1MON/KHuC3wOVKrEfW1cyck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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