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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e418ae91cb575b7a6bead8e893b2c4b2e637efcfba643fe4e4ce1d500cf9fe2' 
  AND token = 'LtbnG6YhCCdTlgkkWfBdcupno4lCumqutTScptAjrw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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