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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f769907ea14f31ab272a1a484c5591aff6d0d5f30d747566fe2fa3d82b8ecf01' 
  AND token = 'zVoAVeya0WvEh4alaEojop49r1SvVuAZtu8FiXqfv20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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