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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7676b80d1f7380ab9e6caa3037205fd6700a1b24bd62dc22143b0292ff15615b' 
  AND token = '2h7yRaV6EH6DHZcZlbMhGCKWZPAUxPMgrDsXJCx2h8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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